The next time your office needs to package a shipment, opt for Quality Park ClearClasp® Postage Saving Envelopes. They're designed to help save money at the post office. The ClearClasp® components dodge the extra charge that's typically associated with metal clasps. And with a smooth Kraft surface, there's plenty of space to add processing labels. Seam Type: Center; Flap Type: Cheese Blade; Trade Size: #90; Security Tinted: No.